锍有两种意义，在化学上代表一正离子，在冶金中代表一互熔体。

• 正离子称作锍(sulfonium)，它是由硫化氢衍生得到的。
• 命名时若为前缀，则称作锍基(sulfonio-)
• 锍，在化学中读音：liǔ。

A sulfonium ion, also known as sulphonium ion or sulfanium ion, is a positively charged ion (a "cation") featuring three organic substituents attached to sulfur. These organosulfur compounds have the formula [SR₃]. Together with a negatively charged counterion, they give sulfonium salts. They are typically colorless solids that are soluble in organic solvent.